Transcript PRESENTED BY: Gautam J (4mc04au013)

PRESENTED BY: Gautam J
(4mc04au013)
Introduction
The internal combustion engine has been
with us since about 1885. With lasting
engine concept, the automakers are
modernizing their I.C engines and
vehicles to be more economical,
environmental friendly and safer
considering the gasoline shortage, the
proposed emission norms and safety
standards. Let us discuss the various
modern trends in the internal combustion
engines and automobiles.
The Trend
Will the internal combustion engine be able to cope with
these challenges also in the future?
Exhaust
emission
Fuel Economy
Safety
Noise and
vibration
Current solutions
Direct fuel Injection
Direct injection is
where fuel is
injected (directly)
into the cylinders,
not mixed with air
in the inlet
manifold or inlet
ports before being
drawn into the
cylinders.
Advantages of Direct fuel injection
Due to multiple injections,
uniform A/F mixture supplied
to cylinder; thus difference in
power developed in each
cylinder is minimum. Noise
and Vibration from the
engine is less.
Since the engine is
controlled by ECU, accurate
A/F mixture supplied
resulting in complete
combustion leading to
effective utilization of fuel
supplied and hence low
emission level.
Some of the types of direct
injection systems
MPFi Engine
Multi Point Fuel Injection
system. In this system
each cylinder has number
of injectors to
supply/spray fuel into the
cylinders .
CRDi Engine
Common Rail Direct
injection system. In this
system, all the injectors
are supplied by a
common fuel supply line
or a manifold called the
common rail.
Variable valve timing and lift
Principle is to use a twoposition advance or retard of
either an engine’s intake or
exhaust camshaft to better
match the engine’s operating
conditions.Two main factors
that determine an I.C engine
performance are
The point at which valves
open.
The duration of the valves
being open.
Some of the types of variable
valve timing system
VTEC Engine (Variable Valve-
Timing and Lift Electronic
Control) VTEC works by
varying valve timing and lift
to compensate for the time
delay and out-of-phase
arrival of the air-fuel charge
at the intake valve. Shifts
valve between two separate
sets of cam lobes—one for
high-speed operation and
one for low.
Advantages
Low fuel consumption
appreciable increase
in power
lower tail pipe
emission.
Valvetronic system,
which can continuously
vary the opening stroke
of the intake valves to
optimize engine power
and efficiency.
reduces pumping
losses
SUPER AND TURBO CHARGERS
Forcing more air into a cylinder allows more fuel to be
burned, generating more power from an engine of a
given weight and size; that's the basic idea behind
super-charging and turbo-charging.
Turbocharger
After exhaust gases leave the
cylinders, they pass into one of
the chambers spinning turbine.
As this turbine spins, it spins the
turbine in the opposite
chamber(compressor). As this
compressor spins, it draws in
outside air and forces it into the
engine intake manifold and
finally into the combustion
chambers.
Supercharger
The key difference between a
turbocharger and a
supercharger is its power
supply. Something has to
supply the power to run the air
compressor. In a supercharger,
there is a belt that connects
directly to the engine. It gets its
power the same way that the
water pump or alternator does.
Types of superchargers
 Roots type
 Twin screw type
 Centrifugal type
Advantages of super and turbo
chargers
Turbochargers are light weight,
mechanical simplicity and durability,
uses engine exhaust, less fuel is
consumed. Since the volume of
exhaust gas is dependent upon
engine load, The greater the load, the
more the turbo boast.
Superchargers are smaller and for
lighter engine, easier to install
 Both help in contol of detonation
Hybrid engines
A hybrid propulsion system uses a
petrol or diesel engine with an electric
motor in some combination.
One variation is to have the wheels
driven only by the electric motor or
motors, current coming from batteries.
The petrol engine drives a generator
to charge the batteries; it can be
turned on and off as needed.
Other variation is to have a relatively
small petrol engine drive the wheels
through a mechanical transmission.
An electric motor provides assistance
when high power is needed overtaking and climbing hills.
Types and advantages of hybrid
engines

Hybrid electric-petroleum vehicles
 Continuously outboard recharged electric vehicle (COREV)
 Hybrid fuel (dual mode)
 Fluid power hybrid
Advantages
 Lower emissions and better
mileage.
 Braking are configured to capture
kinetic energy thus Batteries need not
be charged by an external source.
 Reduce the dependency on fossil
fuels which directely affects fuel
prices.
Rotating Liner Engine
It is developed to reduce
engine friction and increase
fuel economy in Heavy Duty
Engines. The cylinder liner
rotates and a unique
hydrodynamic face seal
replaces the conventional
head gasket. Thus over
comings the piston ring-liner
wear around TDC( due to low
magnitude of sliding speed
around)
Advantages
 Improve efficiency and
reduce fuel consumption.
 Prolong engine life.
Conclusion
Despite the green hype, internalcombustion engines with its latest
and advanced technology will keep
powering vehicles for the
foreseeable future.
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